Projecting lamp



March 16 1926. 1,577,112 G. H. CUSHING PROJECTING LAMP File Nov- 5, 1925 2 Sheets-Sheet 1 w 2; 5 muangb 3 March 16 1 1,577,112

G. H. CUSHING PROJECTING LAMP Filed NO 51 1925 2 Sheets-Sheet 2 Patented Mar. 16, 1926.

UNITED STATES- PATENT" OFFICE.

IROJECTING LAMP.

Application filed November 5, 1925. Serial No. 67,148.

To all whom it may concern:

Be it known that I, GEORGE H. CUsHINe, a citizen of the United States, residing at lVashington, District of Columbia, have invented certain new and useful Improvements in Projecting Lamps, of which the following is a specification.

My invention relates to lamps and, more particularly, to projecting lamps which serve their purpose by the use of reflectors.

This application is a continuance in part of my application Serial No. 744,000, filed October 16, 1924. The primary object of my invention is so to envelo the light source by properly designed reflectors as to assembleall, or nearly all, of the rays into a beam and, thereafter, to intercept that beam by another reflector,

so designed as to divide the beam into;pen-

oils of rays, to distribute them, at will, over any area of predetermined shape and size and at any practical predetermined distance from the light source.

Another important, and incidental, object of my invention is to eflect exact and precise placementof any part orparts of the total light volume from a given light source upon any art or parts of any area of known size and s ape and situated at a known distance from the light source.

Still another object of my invention is to' provide a lamp in which the assembling oi the rays into a beam is done out of ordinary sight; in which the secondary reflector is concealed from ordinary view; and in which the secondary reflector is so designed as to divide the beam into pencils of rays, which, if the reflector is exposed to full view, will have such diverse directions asto make a glare improbable.

'A further object of my invention is to so design the reflectors which envelop the light source that any accidental change in the relative ositions of the light source and the assem' ling reflectors cannot produce a. glare since the whole beam will, under any circumstance, be directed ainst the secondary reflector and will be, by it, divided into such a multiplicityof pencils ofrays as to make a glare at any one point m I ent planes and'a myinventlon-wi-ll, first, take the probable. While form of an 'antiglare he:

t for vehicles, it 15 es enti lly a pro ecting p ndad p able to any purpose where the specific placement of light or where a volume of light View, my invention comprises the parts and combinations to behereinafter set forth and claimed with the understanding that, varying with the purpose to be served, the several necessary elementsmay be varied in construction, proportion and arrangement without departing from the spirit of the appended claims.

In order to make my invention more clearlv understood, I have shown in the accompanying drawings means for carrying the purposes and objects into effect. When examining'the drawings, it must be understood that they are illustrative of the principle rather than being the exact design of any lamp. It must be understood that the curve shown in the modified cylindrical extension of the. parabola is somewhat exaggerated to indicate what, in ractice, will be a slight deviation from a at reflecting surface. It is understood that the same principles will apply regardless of the position of the mechanism to the light source if the secondary reflector is designed to cover a greater number of degrees of arc than the few here shown.

In the drawin s:

Figure 1 is a ongitudinal sectional view.

showing the form and arrangement of the several members constituting my improved ing surfaces lying indifferent planes.-

igure 6 is a diagram showing the contour of amodification of the secondary'reflector with five reflecting j'surfjaces lying in differroachingin contour a sn'ioothcur've as indicated by Figure 7.

- Figure 7 is'a dia'gramshow' a further ramification of t e seconda y m: rth

many reflecting surfaces l 'ing in many different planes and, in e ect, producing a smooth curve.

Referring to the drawings and more particularly to Figure 1, I have shown my lamp structure having: An electric light bulb, l, of standard construction comprising a filament, 2, and a metallic sleeve, 3, which forms the base of the bulb; suitable contacts, 4, to connect the bulb with the electric current; a primary parabolic reflector, 5, surrounding the light source and mounted within the member 6, as shown; a cup shaped housing, 6, to hold the primary reflector, 5, in place and provided with a threaded projection, 6', adapted to be screwed into the memher 7, which is riveted or otherwise permanently secured to a frame or visor, 8; a modified cylindrical extension of the primary reflector, 9, with suitable means, 9, for securing it to member 6, and adapted to be minutely graduated from the most acute to the most obtuse required angle of reflection to assemble portions of the rays into a common beam; a secondary reflector, R, comprising three reflecting surfaces, 10, 11, and 12, lying in different planes and situated to intercept the beam rising from the light source, 1, and the reflected light from the primary reflector, 5, and its extension, 9, and attached by suitable means, 13 and 14, to the frame and visor, 8.

While, for convenience of illustration, 1 have shown the secondar reflector, R, as comprising three planes of reflection, 10, 11, and 12, I wish it understood that I am not confined to this division of the reflecting surface into this number of parts since the primary object, supra, of my lamp is to distribute the light volume, at will, over an area of predetermined size and sha e, which object might, and in practice wil, require a multiplicity of planes of reflect-ion.

Referring further to the drawings and more particularly to Figure 4, I have shown, in diagram: The secondary reflector, R identical in form to R in Figure 1, although reduced in size-*having three planes of reflection, 15, 16, and 17; broken lines indicating the path taken by the li ht in proceeding divers directions from t e said secondary reflector to different arts ofthe path to be lighted; and a base ine, indicating the surface to be lighted.

Referring still further to the drawin s and more particularly to Figures 5, 6, and I have shown, in diagram, the evident effect of increasing the number of planes of reflection in the secondary reflector, R, the said effect being to modify the flat surfaces gradually into a smooth curve. Figure 5 is identical with the secondary reflector, R. of Figure 1.. Figure 6 is the same secondary reflector, R, divided into five planes c efl tive ieetead at the thr p ne shown in Figure 1. And, Figure 7 is the same secondary reflector, R, having a greater number of reflecting surfaces which, due to their multiplicity, take the form of a smooth curve, thus indicating an infinity of planes of reflection to divide the beam into pencils of rays.

The 0 ration of my device is as follows: The lig 1t rays emanating from the light source, 1, are reflected by means of the primary reflector, 5, and directed in parallel rays in the desired direction. Those rays which are not intercepted by the primary reflector, impinge upon the modified cylindrical extension of the housing of the rimary reflector, 9, and are, by it, turned into the path of the rays from the primary reflector. At the point where the rays are brought into a beam, the secondary reflec tor, R, is employed. This reflector is so designed as to take the rays of light and distribute them exclusively upon the part of the road or other-object to be illuminated. The concentration of the light is eflected by the primary reflector and by the modified cylindrical extension, 9, so that the light source or the primary reflector cannot be seen without looking directly through the opening in the member 9, which is im possible to persons at-any distance. The secondary reflector is so situated as to'intercept the beam emanating from the light concentrating devicesand is in turn ordinarily obscured from view by being mounted upon the underside of the frame which also serves as the visor, 8.

I claim:

source,-a primary reflector for converting a portion of the rays into a beam, a tuba-"1 lar reflector mounted forwardly of the primary reflector and having an interior reflectin sur ace of varying curvature to convert t e r ys falling thereon into a beam, means for holdin these two reflectors in constant relations ip to the light source, and a secondary reflector comprisin a plurality of planes of reflection and esi nod and constructed to divide the rays of ight falling thereon into pencils of rays and to distribute said rays exclusively upon an area of predetermined dimensions.

2. A projecting lamp comprising a light source, a primary para olic reflector to convert a portion of-the rays into a beam, a

cylindrical reflector adjacent the primar re-' flector designed to convert there 5 fa ling thereon into a beam, means for 1101 i these two reflectors in constant relation w1th the light source, and a secondary reflector comprisinga plurality of planes of reflection and designed to divide the rays of light fallin thereon into pencils of rays and to distri ute said rays exclusively upon an area 3. In a projecting lamp, a light source, a

parabolic reflector, a secondary reflectorinounted forwardly of the parabolic reflector, a cylindrical reflector on the-parabolic reflector and having its interior reflecting surfaces continuously changing in curvature from the most acute .to the most obtuse required angle of reflection to receive rays which do not impinge upon the parabolic reflector and project them on-the secondary reflector, the secondary reflector comprising minutely graduated surfaces from the most acute to the most obtuse required angle of reflection to sub-divide the beam received from the parabolic reflector and the cylindrical. extension and to distribute the same over an, area of predetermined size and shape. 1

4. A projecting lam comprising a light source, a primary para olic reflector to convert a portion of the rays into a beam, a cylindrical reflector in operative osition adjacent the parabolic reflector an having its interior reflecting surfaces continuously changing in curvature from the most acute to the most obtuse required angle of reflection to receive rays which do not impinge upon the parabolic reflector and project them on the secondary reflector, the secondary reflector comprising a plurality of planes of reflection blended one with the other to form a smooth-curve, said planes being minutely graduated from the most acute to the most obtuse required angle of reflection to' subdivide the beam received from the parabolic reflector and the cylindrical extension and to distribute the same over an area of predi'etermined size and shape.

5. A projecting for vehicles 40 comprising a housing, a light source situated at the bottom1 and towards the back of the housing, a parabolic reflector to convert a portion of the rays from the light source into a beam and project them upward, 'a c lindrical reflector in operative vposition a jacent the parabolic reflector to to divide the beam into pencils of rays and to project them forward and downward upon an area of predetermined dimensions, said housing being adapted to hold the primary and secondary reflectors in fixed relationship to each other and having an extension to serve as avisor to conceal the secondary reflector.

6. A projecting lamp comprising a light source, a primary reflector for converting a portion of the rays into a beam, a tubular reflector mounted forwardly of the primary reflector to convert the rays falling thereon into a beam, means for holdin reflectors in constant relations ip to the light source, and a secondary reflector comprising minutely graduated surfaces from the most acute to the most obtuse required angle of reflection to subdivide said beams and to distribute the same over an area of predetermined size and shape.

In testimony whereof I aflix my signature.

GEORGE H. CUSHING.

these two i 

